| 1001 | Pinedale Energy Partners Operating LLC | Tulsa, OK 74105 | Oil & Gas Operator | Apr 2021 |
| 1002 | Pinedale Investment Inc | Pinedale, WY 82941 | Oil & Gas Operator | Jul 2026 |
| 1003 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Jul 2026 |
| 1004 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | May 2026 |
| 1005 | Pioneer Oil & Gas | South Jordan, UT 84095 | Oil & Gas Operator | Jan 2014 |
| 1006 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 1007 | Pivonka Investments LLC | | Oil & Gas Operator | Jul 2026 |
| 1008 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 1009 | Planet Associates Inc | Denver, CO 80218 | Oil Operator | Dec 1994 |
| 1010 | PML Operating LLC | | Oil Operator | Jul 2026 |
| 1011 | Poc-I LLC | Casper, WY 82605 | Oil & Gas Operator | Jul 2026 |
| 1012 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 1013 | Polfam Exploration Co | Denver, CO 80204 | Oil & Gas Operator | Mar 2007 |
| 1014 | Polumbus Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1982 |
| 1015 | Powder Battalion Holdings LLC | Sheridan, WY 82801 | Gas Operator | Dec 2023 |
| 1016 | Powder River Oil | Golden, CO 80401 | Oil & Gas Operator | Sep 2018 |
| 1017 | Powder River Petroleum | Boerne, TX 78006 | Oil & Gas Operator | Dec 1998 |
| 1018 | Powder River Royalty Inc | | Oil & Gas Operator | Dec 1986 |
| 1019 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Sep 2026 |
| 1020 | PRB Oil & Gas Inc | Denver, CO 80202 | Gas Operator | Jul 2008 |
| 1021 | Preferred Pipeline Corp. | Victoria, TX 77902 | Oil & Gas Operator | Jul 2026 |
| 1022 | Prenalta Corporation | Terrytown, NY 10591 | Oil & Gas Operator | Jan 1997 |
| 1023 | Pride Energy Company An Oklahoma GP | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2026 |
| 1024 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Jul 2026 |
| 1025 | Primary Fuels Inc | Midland, TX 79701-4410 | Oil & Gas Operator | Mar 1991 |
| 1026 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 1027 | Principle Petroleum LLC | Dallas, TX 75313 | Oil Operator | May 2025 |
| 1028 | Pronghorn Operating, LLC | | Oil & Gas Operator | Jun 2026 |
| 1029 | Propel Energy Company | | Oil Operator | Oct 1991 |
| 1030 | Prospective Invest & Trad Co LTD | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2005 |
| 1031 | Proven Petroleum, Inc. | Lakewood, CO 80228 | Oil & Gas Operator | Jun 2026 |
| 1032 | Provident Resources LTD | | Oil & Gas Operator | Dec 1986 |
| 1033 | Puma Petroleum I | | Oil & Gas Operator | Dec 1988 |
| 1034 | Pure Petroleum LLC | Gillette, WY 82717 | Oil & Gas Operator | Aug 2011 |
| 1035 | Purewest Resources Inc | Pinedale, WY 82941 | Oil & Gas Operator | Jun 2026 |
| 1036 | Rael Resources LLC | Cowley, WY 82420 | Oil Operator | Jun 2026 |
| 1037 | Rainbow Oil Company | | Oil & Gas Operator | Aug 1999 |
| 1038 | Rainbow Resources, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2007 |
| 1039 | Ramco Oil & Gas Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2006 |
| 1040 | Ranch Oil Company | West Linn, OR 97068 | Oil & Gas Operator | Jul 2026 |
| 1041 | Ranck Oil Company | Cut Bank, MT 59427 | Oil & Gas Operator | Jun 2026 |
| 1042 | Ranger Holdings Co | | Oil & Gas Operator | Jul 1993 |
| 1043 | Rangeview Resources Operating Co | | Oil & Gas Operator | Jun 2026 |
| 1044 | Rathbun Roger | | Oil & Gas Operator | Dec 1993 |
| 1045 | Rathpro Inc | Douglas, WY 82633 | Oil & Gas Operator | Feb 1994 |
| 1046 | RB Operating Company | Shawnee, OK 74802-1488 | Oil & Gas Operator | Apr 2015 |
| 1047 | RDG Oil & Gas LLC | Post Falls, ID 82854 | Oil & Gas Operator | Mar 2017 |
| 1048 | Reading & Bates Petroleum | | Oil & Gas Operator | Apr 1989 |
| 1049 | Red River Oil & Gas LLC | Cherry Hills, CO 80110 | Oil & Gas Operator | Feb 2025 |
| 1050 | Red Rock Resources Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | Jul 2026 |
| 1051 | Red Tiger Oil & Gas LLC | Gillette, WY 82718 | Oil & Gas Operator | Jul 2026 |
| 1052 | Redbud E & P, Inc. | Giddings, TX 78942 | Oil & Gas Operator | Sep 2026 |
| 1053 | Redstone Gas Partners LLC | Denver, CO 80202 | Gas Operator | Mar 2001 |
| 1054 | Redstone Resources Inc | Newcastle, WY 82701 | Gas Operator | Dec 2010 |
| 1055 | Reef Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Feb 2007 |
| 1056 | Reliance Resources Inc | Houston, TX 77007 | Gas Operator | Jun 2012 |
| 1057 | Remuda Energy Development LLC | Billings, MT 59104 | Oil & Gas Operator | Jul 2026 |
| 1058 | Renor Exploration | Englewood, CO 80111 | Oil Operator | Feb 2001 |
| 1059 | Renos Land & Minerals Company | Casper, WY 82601 | Oil & Gas Operator | Oct 2021 |
| 1060 | Reserve Oil & Gas Company | | Oil & Gas Operator | Jul 1981 |
| 1061 | Reserve Operating Corp. | Houston, TX 77040 | Oil & Gas Operator | Sep 2026 |
| 1062 | Resolute Wyoming Inc | Denver, CO 80203 | Oil & Gas Operator | May 2018 |
| 1063 | Resource Enterprises Inc | Salt Lake City, UT 84108 | Gas Operator | Dec 1990 |
| 1064 | Resources Investment Corp | Denver, CO 80202 | Oil & Gas Operator | Sep 2018 |
| 1065 | Reunion Energy Company | Houston, TX 77056 | Oil & Gas Operator | May 1996 |
| 1066 | Rex Energy Rockies LLC | State College, PA 16801 | Oil & Gas Operator | May 2013 |
| 1067 | Riata Energy, Inc. | Oklahoma City, OK 73101 | Oil & Gas Operator | Nov 2006 |
| 1068 | Richardson Oil Company | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2003 |
| 1069 | Richardson Operating Company | Denver, CO 80237 | Oil & Gas Operator | Jul 2026 |
| 1070 | Ridge Energy Partners LLC | Casper, WY 82601 | Oil Operator | Dec 2018 |
| 1071 | Ridgeland Wyoming Inc | | Oil Operator | Dec 2014 |
| 1072 | Rim Operating, Inc. | Englewood, CO 80112 | Oil & Gas Operator | Sep 2026 |
| 1073 | Rio Blanco Energy, Inc. | Littleton, CO 80121 | Oil & Gas Operator | Oct 2002 |
| 1074 | River City Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Nov 1997 |
| 1075 | River Gas Corporation | Tuscaloosa, AL 35406-2233 | Gas Operator | Dec 2000 |
| 1076 | Rki Exploration & Production LLC | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2026 |
| 1077 | Rme Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Nov 2016 |
| 1078 | Robert Hawkins Inc | Kevin, MT 59454 | Oil & Gas Operator | Jun 2026 |
| 1079 | Rochelle Oil & Gas | Gillette, WY 82717 | Oil & Gas Operator | Mar 2024 |
| 1080 | Rock Creek Resources LLC | Englewood, CO 80112 | Oil & Gas Operator | Dec 2021 |
| 1081 | Rock Oil Corporation | Lawrence, KS 66046 | Oil Operator | Oct 2004 |
| 1082 | Rock River Operating Inc | Laramie, WY 82070 | Oil & Gas Operator | May 2026 |
| 1083 | Rockies Resources Holdings LLC | Lakewood, CO 80228 | Oil & Gas Operator | Jul 2026 |
| 1084 | Rocky Mountain Gas Inc | Sheridan, WY 82801 | Gas Operator | Nov 2009 |
| 1085 | Roemer Oil Company | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 1086 | Roff Operating Company LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 1087 | Ronadero Company Inc | Roswell, NM BAD ADDR | Oil & Gas Operator | Dec 1996 |
| 1088 | Rosa Petroleum | Evansville, WY 82636 | Oil Operator | Dec 1995 |
| 1089 | Royal Oil LLC | Flower Mound, TX 75028 | Oil Operator | Dec 2015 |
| 1090 | Royal Resources Exploration | | Oil & Gas Operator | Mar 1984 |
| 1091 | Ruby Drilling Company Inc | Gillette, WY 82718 | Oil Operator | Oct 2007 |
| 1092 | S & J Operating Company | Wichita Falls, TX 76301 | Oil & Gas Operator | Mar 2015 |
| 1093 | Saba Energy Of Texas Inc | Houston, TX 77042 | Oil & Gas Operator | Jul 2007 |
| 1094 | Sabine Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jul 1996 |
| 1095 | Sabine Oil & Gas Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 1096 | Saga Petroleum LLC Of Colorado | Norman, OK 73072 | Oil & Gas Operator | Sep 2026 |
| 1097 | Sage Butte PRB Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2026 |
| 1098 | Sage Petroleum LLC | Casper, WY 82601 | Oil Operator | Jun 2008 |
| 1099 | Salt Creek Operating LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Mar 2020 |
| 1100 | Salt Creek West Partners | | Oil Operator | Jul 1995 |